Lishen (8.5Ah cells) 4S 3P Busbars and Hardware

When building a Lishen 4S 3P battery pack using 8.5Ah cells, selecting the appropriate busbars and hardware is crucial for ensuring safe and efficient performance. The configuration of 4S (4 cells in series) and 3P (3 cells in parallel) results in a 12-cell battery pack that delivers 4 times the nominal voltage of a single cell, while the parallel configuration increases the capacity to 25.5Ah (8.5Ah x 3).

Busbars

Busbars are used to connect battery cells both in series and parallel. For a 4S 3P pack, busbars should be sized to handle the cumulative current output of the cells in parallel, which could be significant depending on the application. Copper is the most commonly used material due to its excellent conductivity and low resistance, but nickel-plated copper busbars are also popular for their corrosion resistance.

For a pack like this, busbars must be thick enough to handle the current safely without generating excessive heat. Typically, a thickness of 1mm or more and a width that allows sufficient surface area for current flow are recommended. It’s also crucial that the busbars are sized to minimize resistance and ensure consistent current distribution across the cells.

Hardware

When assembling the battery pack, stainless steel bolts, washers, and nuts are commonly used to secure the busbars to the cells. It’s important to use hardware that resists corrosion and ensures a strong, secure connection. Nylon washers are often added to prevent short-circuiting.

Additionally, appropriate insulation materials should be used to avoid accidental shorts between cells or busbars. High-quality battery holders and cell spacers help with mechanical stability, ensuring the pack remains robust over time and is resistant to vibrations.

In summary, choosing the right busbars and hardware ensures that your Lishen 4S 3P pack is efficient, safe, and long-lasting.